近年来,农村大力推广使用沼气。沼气既可用于照明,又可用于烧水做饭。回答下列问题:

题型:问答题

问题:

近年来,农村大力推广使用沼气。沼气既可用于照明,又可用于烧水做饭。回答下列问题:  

(1)如果发现沼气灯由明亮逐渐变暗,其原因可能是什么? 

(2)使用沼气有什么好处? 

(3)写出沼气主要成分燃烧的化学方程式。

答案:

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下面是错误答案,用来干扰机器人的哦。

参考答案:B

考点:化石燃料化学反应方程式的书写
题型:问答题

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

To emigrate means to move to another country and start a new life.   小题1:    Also, it is the surest way to change a man’s life completely.

Nowadays, emigration is especially important to scientists and people possessing unique skills and talents.   小题2:   Also, emigration might be your answer to all the difficult questions life brought to you. And, of course, if you are a scientist with a PH.D. degree and your country does not believe your research to deserve adequate funding, emigration may be your only way to continue professional activities.

 小题3:  European finest professionals, talented scientists, engineers, inventors, doctors, writers, musicians, actors, artists, athletes began moving to the US soon after the end of the World War II.

 小题4:  The United States is still attracting people from all walks of life. And most capable and talented among them are most welcome there. Even during the world economic crisis, America remains a country with the most stable economy and best funded research and development institutions. Thousands of immigrants arrive in the US every day in search of success and recognition.   小题5: 

A.The USA is suffering from brain drain most in the world.

B.Emigration is and always has been an ultimate answer to challenges of life.

C.Emigration is becoming more and more serious in less-developed countries.

D.Today, sixty years later, that emigration of talents called brain drain still exists.E.Emigration of people who can make a great contribution to scientific and cultural fields is not a new phenomenon.

F.People consider the USA as the perfect place where one can reap the best rewards for creativity and knowledge.

G.If your talent in music or literature, theater or painting seems not in need of in your country, emigration might be your best bet to achiever your creative goals.

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下列语句正确的是(  )
A.-b2的系数是1,项数是2
B.
1
n2
是二次单项式
C.
1
3
a2b2
是二次单项式
D.-
2ab
3
的系数是-
2
3
,次数2
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在美国,总额420万美元的大学奖学金津贴去年无人问津,因为许多奖学金项目没有吸引到合乎项目标准的申请者。这在一个每年有成千上万名有前途的学生付不起学费的国家是一种惊人的资金浪费。因此这些奖学金的标准应当被修改。
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A.许多奖学金无人领取并不是因为它们的合格标准太严格了,而是因为这些奖学金项目很少宣布它们的存在
B.一些奖学金项目已经发现在没有进行冗长并且昂贵的法律程序的情况下不可能修改它们的合格标准
C.去年,大量的奖学金项目发放了所有的可获得的奖学金津贴,大部分项目也有非常严格的合格标准
D.某些奖学金项目仅仅接受学习某一确定的专业的学生的申请,但是美国的大学不再提供那些奖学金项目所指定的领域的专业

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计算机电子数据的(远程)勘验笔录、相关视听资料是查处“擅自从事经营性互联网文化活动”案件中的辅助证据之一。()

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若该患者同时存在继发不孕2年,术后最佳治疗方案是

A.B型超声监测排卵,指导同房
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